Topic
Tip-speed ratio
About: Tip-speed ratio is a research topic. Over the lifetime, 1621 publications have been published within this topic receiving 22072 citations.
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TL;DR: In this paper, the feasibility and accuracy of three different CFD approaches, namely 2D URANS, 2.5D LES, and 2D large eddy simulations (LES), were investigated in the aerodynamic characterization of straight-bladed VAWT (SBVAWT), with a focus on the capability of the two.5d LES approach in CFD simulation of high angle of attack (AOA) flow.
185 citations
TL;DR: In this article, an experimental investigation into the properties of the vortex wake behind a wind turbine rotor has been carried out at model scale, using Particle Image Velocimetry (PIV), the two-blade model was operated at tip speed ratios in the range λ=3-8, and chord Reynolds numbers Re=6400-16
181 citations
TL;DR: In this article, a three-stage Savonius rotor with 120 degree bucket phase shift between adjacent stages has been designed and made, and wind tunnel tests make it clear that both the static and dynamic torque variations in one revolution of this three stage rotor have been greatly smoothed in comparison with an ordinary one-stage rotor.
Abstract: In order to decrease the torque variation of a Savonius rotor and improve the starting characteristics, a new type of Savonius rotor, which has three stages with 120-degree bucket phase shift between the adjacent stages, has been designed and made. Wind tunnel tests make it clear that both the static and dynamic torque variations in one revolution of this three-stage rotor have been greatly smoothed in comparison with an ordinary one-stage rotor, which means the improvement of the starting characteristics. The torque characteristics of the rotors with guide vanes were also measured. The guide vanes increased the torque coefficient on the average in the low tip speed ratio but decreased the torque coefficient in high tip speed ratio. Although the present three-stage rotor needs improvement of the aspect ratio of each stage, the three-stage rotor with no guide vane had better torque characteristics than the one-stage rotor with guide vanes for tip speed ratio larger than 0.8.
177 citations
TL;DR: In this paper, the effects of tunnel blockage on the turbine power coefficient in wind tunnel tests of small horizontal-axis wind turbines were quantitatively investigated by measuring the tunnel velocities with and without rotors using a pitot-static tube under various test conditions.
170 citations
TL;DR: In this article, the effect of number of blades on the performance of the model of Savonius type wind turbine was investigated and the experiments used to compare 2, 3, and 4 blades wind turbines to show tip speed ratio, torque and power coefficient related with wind speed.
157 citations